The most important thing to do to keep your voice in tip top shape is to get plenty of rest before performances and keep yourself hydrated.
	Don't belt.  Belting is pushing your chest voice up to a high teseratura and to the point of oversinging.  This can cause damage fast.
	Don't Smoke, it is stupid.
	Don't consume alcohol or caffine before or during singing.  Alcohol can numb the harsh effects of belting, so you cause yourself further damage and caffine constricts the vocal folds.
	Don't scream

 

Links To Other Vocal Health Tips

 

	Maintaining Vocal Health
	Singing Voice Tips On Vocal Health
	Dr. Yagoda's Vocal Health Tips